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The Encyclopedia of Horology

Wristwatch · Fly-back chronograph wristwatch

Breguet Transatlantique Type XX Ref. 3820

Partially verified

The Breguet Transatlantique Type XX, reference 3820, is an 18K white gold self-winding military-style wristwatch. The watch features a tonneau-shaped case with a water-resistant screwed case-back and a 60-minute graduated revolving bezel. The dial is black, displaying suspended Arabic numerals and radial indexes. The chronograph functions include a fly-back mechanism with two round-shaped push-pieces, a 15-minute counter at 3 o'clock, and a 12-hour counter at 6 o'clock. A subsidiary seconds dial is positioned at 6 o'clock, alongside a date aperture. The watch is powered by Caliber 5620/1, which contains 25 jewels. The auction description indicates the case is slightly scratched and recommends an overhaul of the movement. The object is signed on the dial, case, and movement.

Front view of the Breguet Type XX chronograph on a rubber strap.
Front view of the Breguet Type XX chronograph on a rubber strap. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Fly-back chronograph wristwatch
Maker / attribution
Breguet
Reference
3820
Catalogue / lot identifier
159
Source-reported date
circa 1990-2000
Source-reported place
Switzerland
Source-reported serial
44 205

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial

The watch is housed in a tonneau-shaped case crafted from 18K white gold, featuring a water-resistant construction with a screwed case-back. The case is measured at a diameter of 40 mm and the total weight is approximately 132.4 grams. The auction description notes that the case exhibits slight scratching consistent with previous wear.

The black dial is configured with suspended Arabic numerals and radial indexes. Chronograph timing is tracked via a 15-minute subsidiary dial at the 3 o'clock position and a 12-hour subsidiary dial at the 6 o'clock position. A date of the month aperture is also located at the 6 o'clock position, while a subsidiary seconds dial is provided for continuous timekeeping. The hands are described as original.

Evidence for this section
  • “18K white gold, self-winding, "tonneau"-shaped, military-type wristwatch, water-resistant with screwed case-back, 60-minute graduated revolving bezel”
  • “black dial with suspended Arabic numerals and radial indexes, subsidiary seconds at 6, fly-back chronograph with two round-shaped push-pieces, 15-minute counter (subsidiary dial at 3 o'clock), 12-hour couter (subsidiary dial at 6 o'clock) and date of the month (aperture at 6 o'clock).”

Movement and Functionality

The movement is a self-winding fly-back chronograph identified as Caliber 5620/1, containing 25 jewels. This movement allows for the instantaneous resetting and restarting of the chronograph timing function via the push-pieces.

The watch includes an 18K white gold Breguet deployant clasp. Although the watch case and movement are signed, the currently attached strap is marked 'Bell & Ross'.

Evidence for this section
  • “self-winding, "tonneau"-shaped, military-type wristwatch”
  • “Caliber 5620/1, 25 jewels”
  • “Overhaul recommended, at buyer's expense”
  • “Signature dial, case and movement”

Provenance and Authenticity

The watch is identified by reference number 3820 and case number 44 205. The movement is numbered 0 123 873. The manufacturer is stated as Breguet, with the origin attributed to Switzerland. The estimated production period is circa 1990-2000.

The auction description provides a grading system for the watch, assigning a grade of AA. The case is graded as '3-8 Good' with slight scratches, while the movement is graded as '2* Very good' subject to the recommended service. The dial is rated as '2-01 Very good'.

Evidence for this section
  • “Reference 3820”
  • “Year circa 1990-2000”
  • “Case No. 44 205”
  • “Movement No. 0 123 873”

Open research questions

  • Does the presence of a Bell & Ross signed strap indicate a non-original configuration for this lot?
  • Can the movement number 0 123 873 be used to narrow the production date beyond the provided decade?

Source evidence

Recorded claims and source quotations for Breguet Transatlantique Type XX Ref. 3820
FieldSource-reported valueSource quotation
MakerBreguet“Brand Breguet”
Reference3820“Reference 3820”
Serial Number44 205“Case No. 44 205”
Movement Number0 123 873“Movement No. 0 123 873”
Material18K white gold“18K white gold”
Caliber5620/1“Caliber 5620/1”
Dimensions40 mm diameter“Diameter 40 mm.”
Weight132.4 grams“Weight 132.4 gr. (approx.)”

Visible details

  • Rotating bezel with 60-minute graduation
  • Subsidiary dial layout at 3 and 6 o'clock
  • Date aperture integrated into the 6 o'clock sub-dial
  • Case-back engraved with reference and individual serial number

Research qualifications

  • The watch is fitted with a strap signed 'Bell & Ross' rather than Breguet
  • The movement condition is reported to require an overhaul

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

BREGUET REF. 3820, FLY-BACK CHRONOGRAPH, MINUTE AND HOUR COUNTERS; "TRANSATLANTIQUE" "TYPE XX"; 18K WHITE GOLD

Reviewed 2026-10-26 · Record 55d66dabba

Terms in this record

Glossary explanations for terms named in this object’s record.

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